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Pagination.php @ 1

Last change on this file since 1 was 1, checked in by dungnv, 11 years ago

File size: 8.8 KB

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1	<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
2	/**
3	* CodeIgniter
4	*
5	* An open source application development framework for PHP 5.1.6 or newer
6	*
7	* @package CodeIgniter
8	* @author ExpressionEngine Dev Team
9	* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
10	* @license http://codeigniter.com/user_guide/license.html
11	* @link http://codeigniter.com
12	* @since Version 1.0
13	* @filesource
14	*/
15
16	// ------------------------------------------------------------------------
17
18	/**
19	* Pagination Class
20	*
21	* @package CodeIgniter
22	* @subpackage Libraries
23	* @category Pagination
24	* @author ExpressionEngine Dev Team
25	* @link http://codeigniter.com/user_guide/libraries/pagination.html
26	*/
27	class CI_Pagination {
28
29	var $base_url = ''; // The page we are linking to
30	var $prefix = ''; // A custom prefix added to the path.
31	var $suffix = ''; // A custom suffix added to the path.
32
33	var $total_rows = 0; // Total number of items (database results)
34	var $per_page = 10; // Max number of items you want shown per page
35	var $num_links = 2; // Number of "digit" links to show before/after the currently viewed page
36	var $cur_page = 0; // The current page being viewed
37	var $use_page_numbers = FALSE; // Use page number for segment instead of offset
38	var $first_link = '&lsaquo; First';
39	var $next_link = '>';
40	var $prev_link = '<';
41	var $last_link = 'Last &rsaquo;';
42	var $uri_segment = 3;
43	var $full_tag_open = '';
44	var $full_tag_close = '';
45	var $first_tag_open = '';
46	var $first_tag_close = ' ';
47	var $last_tag_open = ' ';
48	var $last_tag_close = '';
49	var $first_url = ''; // Alternative URL for the First Page.
50	var $cur_tag_open = ' <strong>';
51	var $cur_tag_close = '</strong>';
52	var $next_tag_open = ' ';
53	var $next_tag_close = ' ';
54	var $prev_tag_open = ' ';
55	var $prev_tag_close = '';
56	var $num_tag_open = ' ';
57	var $num_tag_close = '';
58	var $page_query_string = FALSE;
59	var $query_string_segment = 'per_page';
60	var $display_pages = TRUE;
61	var $anchor_class = '';
62
63	/**
64	* Constructor
65	*
66	* @access public
67	* @param array initialization parameters
68	*/
69	public function __construct($params = array())
70	{
71	if (count($params) > 0)
72	{
73	$this->initialize($params);
74	}
75
76	if ($this->anchor_class != '')
77	{
78	$this->anchor_class = 'class="'.$this->anchor_class.'" ';
79	}
80
81	log_message('debug', "Pagination Class Initialized");
82	}
83
84	// --------------------------------------------------------------------
85
86	/**
87	* Initialize Preferences
88	*
89	* @access public
90	* @param array initialization parameters
91	* @return void
92	*/
93	function initialize($params = array())
94	{
95	if (count($params) > 0)
96	{
97	foreach ($params as $key => $val)
98	{
99	if (isset($this->$key))
100	{
101	$this->$key = $val;
102	}
103	}
104	}
105	}
106
107	// --------------------------------------------------------------------
108
109	/**
110	* Generate the pagination links
111	*
112	* @access public
113	* @return string
114	*/
115	function create_links()
116	{
117	// If our item count or per-page total is zero there is no need to continue.
118	if ($this->total_rows == 0 OR $this->per_page == 0)
119	{
120	return '';
121	}
122
123	// Calculate the total number of pages
124	$num_pages = ceil($this->total_rows / $this->per_page);
125
126	// Is there only one page? Hm... nothing more to do here then.
127	if ($num_pages == 1)
128	{
129	return '';
130	}
131
132	// Set the base page index for starting page number
133	if ($this->use_page_numbers)
134	{
135	$base_page = 1;
136	}
137	else
138	{
139	$base_page = 0;
140	}
141
142	// Determine the current page number.
143	$CI =& get_instance();
144
145	if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE)
146	{
147	if ($CI->input->get($this->query_string_segment) != $base_page)
148	{
149	$this->cur_page = $CI->input->get($this->query_string_segment);
150
151	// Prep the current page - no funny business!
152	$this->cur_page = (int) $this->cur_page;
153	}
154	}
155	else
156	{
157	if ($CI->uri->segment($this->uri_segment) != $base_page)
158	{
159	$this->cur_page = $CI->uri->segment($this->uri_segment);
160
161	// Prep the current page - no funny business!
162	$this->cur_page = (int) $this->cur_page;
163	}
164	}
165
166	// Set current page to 1 if using page numbers instead of offset
167	if ($this->use_page_numbers AND $this->cur_page == 0)
168	{
169	$this->cur_page = $base_page;
170	}
171
172	$this->num_links = (int)$this->num_links;
173
174	if ($this->num_links < 1)
175	{
176	show_error('Your number of links must be a positive number.');
177	}
178
179	if ( ! is_numeric($this->cur_page))
180	{
181	$this->cur_page = $base_page;
182	}
183
184	// Is the page number beyond the result range?
185	// If so we show the last page
186	if ($this->use_page_numbers)
187	{
188	if ($this->cur_page > $num_pages)
189	{
190	$this->cur_page = $num_pages;
191	}
192	}
193	else
194	{
195	if ($this->cur_page > $this->total_rows)
196	{
197	$this->cur_page = ($num_pages - 1) * $this->per_page;
198	}
199	}
200
201	$uri_page_number = $this->cur_page;
202
203	if ( ! $this->use_page_numbers)
204	{
205	$this->cur_page = floor(($this->cur_page/$this->per_page) + 1);
206	}
207
208	// Calculate the start and end numbers. These determine
209	// which number to start and end the digit links with
210	$start = (($this->cur_page - $this->num_links) > 0) ? $this->cur_page - ($this->num_links - 1) : 1;
211	$end = (($this->cur_page + $this->num_links) < $num_pages) ? $this->cur_page + $this->num_links : $num_pages;
212
213	// Is pagination being used over GET or POST? If get, add a per_page query
214	// string. If post, add a trailing slash to the base URL if needed
215	if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE)
216	{
217	$this->base_url = rtrim($this->base_url).'&'.$this->query_string_segment.'=';
218	}
219	else
220	{
221	$this->base_url = rtrim($this->base_url, '/') .'/';
222	}
223
224	// And here we go...
225	$output = '';
226
227	// Render the "First" link
228	if ($this->first_link !== FALSE AND $this->cur_page > ($this->num_links + 1))
229	{
230	$first_url = ($this->first_url == '') ? $this->base_url : $this->first_url;
231	$output .= $this->first_tag_open.'<a '.$this->anchor_class.'href="'.$first_url.'">'.$this->first_link.'</a>'.$this->first_tag_close;
232	}
233
234	// Render the "previous" link
235	if ($this->prev_link !== FALSE AND $this->cur_page != 1)
236	{
237	if ($this->use_page_numbers)
238	{
239	$i = $uri_page_number - 1;
240	}
241	else
242	{
243	$i = $uri_page_number - $this->per_page;
244	}
245
246	if ($i == 0 && $this->first_url != '')
247	{
248	$output .= $this->prev_tag_open.'<a '.$this->anchor_class.'href="'.$this->first_url.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
249	}
250	else
251	{
252	$i = ($i == 0) ? '' : $this->prefix.$i.$this->suffix;
253	$output .= $this->prev_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$i.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
254	}
255
256	}
257
258	// Render the pages
259	if ($this->display_pages !== FALSE)
260	{
261	// Write the digit links
262	for ($loop = $start -1; $loop <= $end; $loop++)
263	{
264	if ($this->use_page_numbers)
265	{
266	$i = $loop;
267	}
268	else
269	{
270	$i = ($loop * $this->per_page) - $this->per_page;
271	}
272
273	if ($i >= $base_page)
274	{
275	if ($this->cur_page == $loop)
276	{
277	$output .= $this->cur_tag_open.$loop.$this->cur_tag_close; // Current page
278	}
279	else
280	{
281	$n = ($i == $base_page) ? '' : $i;
282
283	if ($n == '' && $this->first_url != '')
284	{
285	$output .= $this->num_tag_open.'<a '.$this->anchor_class.'href="'.$this->first_url.'">'.$loop.'</a>'.$this->num_tag_close;
286	}
287	else
288	{
289	$n = ($n == '') ? '' : $this->prefix.$n.$this->suffix;
290
291	$output .= $this->num_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$n.'">'.$loop.'</a>'.$this->num_tag_close;
292	}
293	}
294	}
295	}
296	}
297
298	// Render the "next" link
299	if ($this->next_link !== FALSE AND $this->cur_page < $num_pages)
300	{
301	if ($this->use_page_numbers)
302	{
303	$i = $this->cur_page + 1;
304	}
305	else
306	{
307	$i = ($this->cur_page * $this->per_page);
308	}
309
310	$output .= $this->next_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$this->prefix.$i.$this->suffix.'">'.$this->next_link.'</a>'.$this->next_tag_close;
311	}
312
313	// Render the "Last" link
314	if ($this->last_link !== FALSE AND ($this->cur_page + $this->num_links) < $num_pages)
315	{
316	if ($this->use_page_numbers)
317	{
318	$i = $num_pages;
319	}
320	else
321	{
322	$i = (($num_pages * $this->per_page) - $this->per_page);
323	}
324	$output .= $this->last_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$this->prefix.$i.$this->suffix.'">'.$this->last_link.'</a>'.$this->last_tag_close;
325	}
326
327	// Kill double slashes. Note: Sometimes we can end up with a double slash
328	// in the penultimate link so we'll kill all double slashes.
329	$output = preg_replace("#([^:])//+#", "\\1/", $output);
330
331	// Add the wrapper HTML if exists
332	$output = $this->full_tag_open.$output.$this->full_tag_close;
333
334	return $output;
335	}
336	}
337	// END Pagination Class
338
339	/* End of file Pagination.php */
340	/* Location: ./system/libraries/Pagination.php */

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source: sourcecode/system/libraries/Pagination.php @ 1

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